Form for concrete tops for cisterns, &amp;c.



G. MORGAN. FORM FOR CONCRETE TOPS FOR GISTEBNS, 6w.

APPLICATION FILED OCT. 16, 1913.

Patented Feb. 2, 1915.

Gag/Marya Inventor M/ S at Attorney Witness 4)., PHOTO-LITHIL, WASHINGTON D. CJ

9, a clamp-bar engaging below the clamp- GUY MORGAN, OF MIDDLETOWN, OHIO.

FORM FOR concnnrn rors ron crsrnims, 850.

I Specification of Letters Patent.

Patented Feb. 2, 1915.

Application filed October 16, 1913. Serial No. 795,454.

Toall whom it may concern:

Be it known that I, GUY MORGAN, a citizen of the United States, residing in Middletown, Butler county, Ohio, have invented certain new and useful Improvements in Forms for Concrete Tops for Cisterns, &c., of which the following is a specification.

In the building of cisterns, sewer-chambers, etc., it is common to build the walls of brick or to mold them of concrete around suitable forms, and then to form the roof by brick arching or by concrete'molding. My present invention does not concern itself with the wall-work of such structures but limits itself to a peculiar construction of form to be employed in molding the concrete roof.

'My invention will be readily understood from the following description, taken in connection with the accompanyingdrawing in which z- Figure 1, is a diametrical vertical section of a cistern, or the like, having applied to it my improved top form ready for the molding of the concrete roof; Fig. 2, a plan of one of the form-segments; and Fig. 3, a vertical transverse section of one of the form-segments, in the plane indicated by the dotted line in Fig. 2. r

A diversity of scales is employed in the drawing.

In the drawing :1, indicates thewall of the cistern or other chamber which is to be provided with a concrete roof; 2, the earth surrounding the wall; 3, sheet-metal segments of such dimensions as to extend from the wall to the central opening in the .roof, and of such width as to be withdrawable through the central opening when the roof is completed; 4, an angle-iron secured to and along one edge of each segment and projecting sidewise therefrom; 5, a gage secured to the outer end of each angle-iron and adapted to engage the inner surface of the wall and position the angle-iron'and its attached segment in the radial direction; 6, a gaging claw at the outer end of each angle-iron and adapted to rest upon the wall and position the outer ends of the angle-irons vertical; 7 a clamp-piece adapted to engage under the inner ends of the angle-irons; 8, the usual top-ring employed in margining the opening in the top of the cistern, this top-ring engaging over the inner ends of the segments;

piece 7; 10, a clamp-bar engaging over topring 8; 11, a clamp-bolt extending through clamp-bars 9 and 10 and serving to draw clamp-piece 7 and top-ring 8 against the angle-irons so as to clamp the angle-irons between them; 12, a nut upon the upper end of the clamp-bolt; 13, the radial margins of the segments at the sides of the segments opposite'the sides which are provided with angleirons; 14, a groove extending along between the angle-irons and the edges of the segments which are attached to the angle-irons; and 15, a downwardly projecting fold radially disposed in each segment and serving to give transverse flexibility to the segments, the fold opening more or less, with a hingelike action and permitting the metal at each side of the fold to take varying angular relationships to each other.

It is, of course, to be understood that the sheet-metal form-parts and their angleirons areto. be of a form and size suited to the chamber whose roof is to be molded. It has been thought best to illustrate the device as adapted for molding the roof of a cistern with a circular wall to have a frustoconical roof. In using the device in forming the roof of a circular cistern, the segments are arranged in circumferential order with the gages 5 and 6 engaging the Wall, the groove 14 at each angle-iron being engaged by'the opposite edge of the following segment. Fold 15 gives to each segment a transverse flexibility permitting it to more readily conform itself to the frusto-conical form-and to permit the edges 13 to readily engage within the groove 14. When the segments have been thus associated a fairly strong mold-structure has been produced. Top-ring 8 is now to be positioned and the clamping parts applied in an obvious man, (1617. The concrete is now to be applied and when it has properly set then the clampingwork is removed and Withdrawn through the top-ring. which remains in the concrete work as a part of the roof structure. One of the segments may now be pulled loose from under the roof and withdrawn through the top-ring, after which the remaining seg ments may be withdrawn in succession. It has been found in practice that the device is very efficient and that it may be placed in working position and withdrawn therefrom by one man, and that no inte i or supporting work is necessary.

a" support for the inner ends of the angle irons, gages carried by the. outer ends the ed Ltorest upon of illeeh eme al t embe e we rv in re xami e hekceetm gaging'oversaid' to ing and; eloyv their angle-irons and adapted to engage Withinand ahoye thegyvall .of the chamber o-ver Which the roof is tobe erected, sheet.-

metal members eaoh havin'g one edge 's'ecured t w e e d eeleir 1mend he iee t peer Beig "adapt d to eef 11pm a other. One-10f ne e ene 2 'i e fiebsten:

e Ht ii efii QffQhQ ea le- 1 nd a ertd 9 enea eth nner ls rfae @1151 Pe elf the. W l 16 thw amber ev r he ree is t e s t dksh emetel members eaeh hav ng pag .edge ec1,i d t v n 10 said m, a hepe t e PPQQ th 1ae e d eet 'e to nerendswef h ae l ii e seembine 13 11 tantie l ae k are az qrm flmmee merges @111 pe i ne, an e-i een e t esiieg 'iewaind Q'm i h P P 9 th PlBy ge? came byqa ou er end nf mar emm an dapt engae th ew? su fa e and a h% av ne twee-wi d w ev nt id n lefi e en hee i s et er ed e dapted I es lep n'eee he fl e the ne le mae a he 13; g re in wee -the inner endsof said sheemmetal members and I ante 1, rv i me einine the eeetrel irons, a erossba-r disposed ve r I sheetarneta l me Q angle-irons extending inward-1y from. the outer portion of the intfilldfidi im i prisleg 0 iewi aga eet th eee e aire tee-1&

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